A ductile high entropy alloy strengthened by nano sigma phase

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

  • Lu Zhang
  • Xiaofeng Huo
  • Anguo Wang
  • Xinghao Du
  • Li Zhang
  • Naifu Zou
  • Gang Wan
  • Guosheng Duan
  • Baolin Wu

Detail(s)

Original languageEnglish
Article number106813
Journal / PublicationIntermetallics
Volume122
Online published29 Apr 2020
Publication statusPublished - Jul 2020

Abstract

A nanoscale sigma (σ) phase strengthened Co34.5Cr30Ni26.5Al5.4W3.6 (at, %) high entropy alloy was prepared and showed high strength and ductility. Dual phase microstructure that comprises face-centered cubic (FCC) matrix and nanoscale σ particles was obtained after thermomechanical procedures. The excellent ductility is attributed to its high strain hardening exponent FCC matrix that strongly favors uniform deformation and prevents crack propagation. The alloy shows an extremely high strain hardening rate and strength due to the interactions between the σ particles, deformation twins and dislocations. The design concept of “deformation twins + nano particles” should be considered for the design of additional double-high (strength and ductility) FCC HEAs in future work.

Research Area(s)

  • Ductility, High entropy alloy, Intermetallic phase, Precipitation hardening, Strength, Work hardening

Citation Format(s)

A ductile high entropy alloy strengthened by nano sigma phase. / Zhang, Lu; Huo, Xiaofeng; Wang, Anguo; Du, Xinghao; Zhang, Li; Li, Wanpeng; Zou, Naifu; Wan, Gang; Duan, Guosheng; Wu, Baolin.

In: Intermetallics, Vol. 122, 106813, 07.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review